Figure 20-2 Cardiac Cycle

Use Figure 20-2 to answer the following questions:
-What occurs at "A" on the graph?
A) Semilunar valve opens.
B) Semilunar valve closes.
C) AV valve opens.
D) AV valve closes.
E) end systolic volume

Question

Figure 20-2 Cardiac Cycle
 
Use Figure 20-2 to answer the following questions:
-What occurs at "A" on the graph?
A) Semilunar valve opens. 
B) Semilunar valve closes. 
C) AV valve opens. 
D) AV valve closes. 
E) end systolic volume

Quizplus · Accepted Answer

At point A on the graph, the semilunar valve opens. This is because the pressure in the ventricle is greater than the pressure in the aorta, causing the semilunar valve to open and allow blood to flow out of the ventricle.